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Finding the Fourth Proportional to 1,411.40, 2,117.12 and 671.09

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Solution

The fourth proportional to 1,411.40, 2,117.12 and 671.09 is: 1,006.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.40 : 2,117.12 = 671.09 : x
  2. Step 2: Convert to fraction form
    1,411.40/2,117.12 = 671.09/x
  3. Step 3: Cross multiply
    1,411.40x = 2,117.12 × 671.09
  4. Step 4: Simplify right side
    1,411.40x = 1,420,774.00
  5. Step 5: Solve for x
    x = 1,420,774.00/1,411.40
  6. Step 6: Final answer
    x = 1,006.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.